Dart

HTTP - Verify Server is a Trusted Root CA

See more HTTP Examples

Demonstrates how to only allow connections to an HTTP server having a certificate with a root that is in our list of trusted CA root certificates. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  //  On my particular system, the root CA cert for this URL is not pre-installed.
  //  Note: This may be different for you.
  //  Also, this example was written on 29-May-2015.  This URL was valid at the time,
  //  but may not be valid at a future date.
  final url = 'https://animals.nationalgeographic.com/animals/invertebrates/starfish/';

  final http = CkHttp();

  //  Require that the SSL/TLS server certificate is not expired,
  //  and that the certificate signature is valid.
  //  This does not ensure that it has a chain of authentication to
  //  a trusted root.  To ensure that, the TrustedRoots object (below) is required.
  http.requireSslCertVerify = true;

  //  Do the HTTPS page fetch (through the SSH tunnel)
  String html;
  try {
    html = http.quickGetStr(url);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('The HTTP GET was successful.');

  //  Now let's require that HTTP requests to SSL/TLS servers that don't have trusted CA roots
  //  should fail.
  final trustedRoots = CkTrustedRoots();

  //  Indicate that we will trust any pre-installed certificates on this system.
  //  (The meaning of pre-installed certificates depends on the operating system, and in
  //  some environments there is no such thing as pre-installed certificates.  See the reference
  //  documentation for the TrustedRoots class.)
  trustedRoots.trustSystemCaRoots = true;

  //  Activate the trusted roots globally for all Chilkat objects.
  //  This call really shouldn't fail, so we're not checking the return value.
  trustedRoots.activate();

  //  Given that our previous HTTP GET likely kept the connection open,
  //  make sure that all HTTP connections are closed before re-trying.
  //  Otherwise, we'll simply be re-using the pre-existing connection.
  http.closeAllConnections();

  //  Now let's try fetching the URL again.  It should fail this time because
  //  there is a requirement that the SSL/TLS server certificate must have a trusted root,
  //  and the trusted root for this URL is not installed on my system (but may be different for you..)
  try {
    html = http.quickGetStr(url);
    print(http.lastErrorText);
    print('Hmmm... we did not fail as expected?');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    print('Good, the HTTP request failed as expected.');
  }
}